Review fixes


sql/item.h:
  Review fixes
sql/item_cmpfunc.h:
  Review fixes
sql/item_func.h:
  Review fixes
sql/item_strfunc.h:
  Review fixes
sql/item_timefunc.h:
  Review fixes
sql/item_xmlfunc.h:
  Review fixes
sql/partition_info.cc:
  Review fixes
sql/partition_info.h:
  Review fixes
sql/sql_partition.cc:
  Review fixes
sql/sql_yacc.yy:
  Review fixes